Crude methanol refinery technology
China [CN] |
No.
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Crude methanol rectification process
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Feature
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1
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single-column process
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1.Methonal-water regroup, separate in one column 2.Advatange: investment saving, reduce heat energy consumption 3.Disadvantage: the purity of refined methonal is not very pure.
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2
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two-column process
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1.The combination of pre-recification column and main rectification column 2.Refine crude methonol including dimethyl ether and other light components and reducing impurities 3.Advantage: simple process ,user friendly, less investment 4.Disadvange: high energy consumption, low purity
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3
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three -column process
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1.Three rectification column work under the same pressure. The third rectification column produces 2.Advantage: high purity 3.Disadvantage: high investment. Need more area
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4
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energy-saving three-column process
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1.Two main rectification columns and final rectification column, the first main rectification column is pressure-increasing column. The second one is normal pressure column. Two columes produce 50%-50% 2.Advantage: envery saving, reduce the ethanol content of the purified methanol, product quality is better; methanol yield is higher, low operating costs 3.Disadvantage: high one-time investment
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